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Ultra-high ion selectivity hybrid proton exchange membrane incorporated by zwitterion-decorated graphene oxide for vanadium redox flow battery

Abstract

An ultra-high ion-selectivity hybrid membrane (SPEEK/ZC-GO) composed of sulfonated poly(ether ether ketone) (SPEEK) and zwitterion-decorated graphene oxide (ZC-GO) containing ammonium and sulfonic acid groups is designed and prepared for all vanadium redox flow battery (VRFB). SPEEK/ZC-GO hybrid membranes exhibit higher proton conductivity and lower vanadium ion permeability than pristine SPEEK and Nafion 117 membrane. The good trade-off effect between proton conductivity and vanadium ion permeability offers an ultra-high ion selectivity to SPEEK/ZC-GO hybrid membranes, and SPEEK/ZC-GO-2 hybrid membrane gives the highest ion selectivity, 26.0×103 S min cm-3, which is about 6.5 and 6.0-fold higher than Nafion 117 (4.0×103 S min cm-3) and pristine SPEEK membrane (4.3×103 S min cm-3), respectively. The VRFB with SPEEK/ZC-GO-2 hybrid membrane exhibits significant slower self-discharge rate, retaining an open circuit voltage of 1.3 V for 132 h, than Nafion 117 (23.5 h) and pristine SPEEK membrane (38 h). SPEEK/ZC-GO-2 hybrid membrane demonstrates higher coulombic efficiencies (CE: 98.5-99.2%) and energy efficiencies (EE: 91.4-83.9%) at 50-100 mA cm-2, as compared with Nafion 117 (CE: 94.0-97.1%, EE: 83.5-74.7%) and pristine SPEEK membrane (CE: 94.5-97.6%, EE: 82.1-74.4%). Stable cycling performance over more than 200 cycles proves the high chemical stability of SPEEK/ZC-GO-2 hybrid membrane under a long-term operation. This investigation indicates SPEEK/ZC-GO hybrid membrane is a promising proton exchange membrane for VRFB system through controlling the desirable ultra-high ion selectivity.

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Publication details

The article was received on 19 Feb 2019, accepted on 09 Apr 2019 and first published on 10 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01891C
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Ultra-high ion selectivity hybrid proton exchange membrane incorporated by zwitterion-decorated graphene oxide for vanadium redox flow battery

    Y. Zhang, H. Wang, B. Liu, J. Shi, J. Zhang and H. Shi, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01891C

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